Maybe you have a dog or cat who greets you with a sneezing fit once you walk in the door from work. Is it possible you’re the problem?

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Sources:

http://news.nationalgeographic.com/2015/04/150411-dogs-cats-allergies-science-pets-animals/

http://www.popsci.com/science/article/2011-07/fyi-why-my-cat-so-sneezy

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4716287/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4269597/

http://onlinelibrary.wiley.com/doi/10.1111/vde.12416/full

https://www.livescience.com/32337-is-house-dust-mostly-dead-skin.html